Facebook's privacy policies are confusing to many people, and the company has changed them frequently, almost always allowing more information to be exposed in more ways.

One day when I was 16, I rode my bike to the nearby DMV office to get my driver's permit. Some of my friends already had their licenses, so I figured it was time. But when I handed the clerk my green card as proof of U.S. residency, she flipped it around, examining it. 'This is fake,' she whispered. 'Don't come back here again.'

In 2007, Zuckerberg announced that Facebook would become a 'platform,' meaning that outside developers could start creating applications that would run inside the site. It worked.

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